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Analog Devices Inc./Maxim Integrated LM4040AEX3-5.0-T
- Part No.:
- LM4040AEX3-5.0-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040AEX3-5.0-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
LM4040AEX3-5.0-T from Maxim Integrated is a precision 5.000V two-terminal shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±100ppm/°C temperature coefficient, and guaranteed operation from -40°C to +125°C. It delivers stable reverse-breakdown voltage with 60μA to 15mA shunt current capability and requires no external capacitor for stability-ideal for high-reliability industrial sensor signal conditioning.
For engineers reviewing the LM4040AEX3-5.0-T datasheet, LM4040AEX3-5.0-T pinout, LM4040AEX3-5.0-T application, or LM4040AEX3-5.0-T equivalent, this page provides verified specifications, validated pin functions, real-world use scenarios in battery-powered instrumentation, and confirmed alternative parts with documented performance trade-offs.
Technical Context
The LM4040AEX3-5.0-T uses bandgap-based shunt regulation to maintain a precise 5.000V reverse breakdown voltage across its terminals under 60μA–15mA cathode-to-anode current. Its internal laser-trimmed resistor network ensures 0.1% initial tolerance at +25°C and ±100ppm/°C max drift over -40°C to +125°C.
It exhibits low dynamic impedance (≤1.1Ω at 1mA), 80µVRMS wideband noise (10Hz–10kHz), and stable operation into any capacitive load-enabling direct integration into ADC reference inputs, DAC bias networks, and microcontroller VREF circuits without compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V ±5.0mV at +25°C - enables accurate 12-bit ADC full-scale calibration with ≤0.1% gain error contribution |
| Initial Accuracy | 0.1% (±5mV) - eliminates need for system-level trimming in portable medical sensors |
| Temp Coefficient | ±100ppm/°C max - limits voltage drift to ±12.5mV over full -40°C to +125°C range |
| Shunt Current Range | 60μA to 15mA - supports ultra-low-power sleep modes and high-current precision references |
| Dynamic Impedance | ≤1.1Ω at 1mA - maintains <1mV output perturbation during 1mA load transients |
| Wideband Noise | 80µVRMS (10Hz–10kHz) - preserves SNR in 16-bit SAR ADC applications |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
LM4040AEX3-5.0-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is NC (no connection) and must remain unconnected or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias input terminal; connects to higher-potential supply rail via series resistor |
| 2 (–) | Anode | Reference ground node; ties to system GND or low-impedance analog return |
| 3 (N.C.) | No Connection | Must be left floating or shorted to pin 2; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% PCB space vs. SOT23 in wearables and IoT nodes |
| No output capacitor required | Stable into any capacitive load - eliminates BOM cost and layout risk of external COUT |
| Laser-trimmed precision | 0.1% initial accuracy achieved via on-die resistor trimming - reduces calibration overhead |
| High-temp grade (E suffix) | Rated for continuous operation up to +125°C ambient - suitable for industrial PLC modules |
| Low 80µVRMS noise | Enables <1 LSB error in 16-bit ADCs with 5V reference span |
Applications
| Portable Medical Sensors | Industrial Process Transmitters |
|---|---|
Use Scenario: Battery-powered pulse oximeter front-end requiring stable 5V reference for analog signal chain. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and ADC reference for photodiode current measurement. Use Value: 0.1% accuracy and ±100ppm/°C TC ensure <0.5% total measurement error across body-temperature operating range. | Use Scenario: 4–20mA loop-powered pressure transmitter operating in factory-floor environments. IC Role / Device Role / Timing Role: Precision 5V reference for sigma-delta ADC and DAC feedback path. Use Value: Guaranteed -40°C to +125°C operation and 80µVRMS noise enable sub-0.1% FS repeatability in harsh thermal conditions. |
| Automotive Cabin Controllers | Energy Metering IC Reference |
Use Scenario: HVAC control module requiring reliable reference for temperature and humidity sensing. IC Role / Device Role / Timing Role: Stable 5V shunt reference powering analog sensor interfaces and MCU VREF. Use Value: E-grade qualification and no-output-capacitor design simplify AEC-Q200-compliant layout and reduce component count. | Use Scenario: Polyphase electricity meter using isolated ADCs with external reference. IC Role / Device Role / Timing Role: Primary 5.000V reference source for metrology-grade ADC conversion. Use Value: Low dynamic impedance (<1.1Ω) prevents reference droop during fast ADC sampling bursts, preserving energy billing accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable 1.24V–18V output; 0.5% initial accuracy; 90ppm/°C TC; SOT23-3 | Requires external resistors for 5V setting; higher minimum cathode current (80μA) | Choose when adjustable output or wider voltage range is needed; verify layout compatibility with SOT23 footprint |
| ADR3450ARJZ-R7 | Fixed 5.0V; 0.1% accuracy; 30ppm/°C TC; SC70-5; 3.5µA quiescent current | Series reference (not shunt); requires input voltage ≥5.3V; higher cost | Choose when ultra-low tempco or series topology simplifies power architecture; confirm supply headroom availability |
Compared with TLVH431ACDBVR and ADR3450ARJZ-R7, the LM4040AEX3-5.0-T offers the smallest SC70-3 footprint, true shunt operation with no minimum input voltage constraint, and optimal balance of accuracy, noise, and thermal stability for space-constrained industrial designs.
Availability
LM4040AEX3-5.0-T is available at Aetrix Electronics and suitable for portable medical devices, industrial process transmitters, and automotive cabin controllers requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040AEX3-5.0-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated is a semiconductor company specializing in analog and mixed-signal ICs for power, sensing, interface, and communication applications.
The LM4040 product line delivers precision micropower shunt voltage references optimized for space-constrained, battery-operated, and high-temperature industrial systems where stability, accuracy, and minimal external components are critical.
FAQ
What is the exact reverse breakdown voltage tolerance of LM4040AEX3-5.0-T at +25°C?
The LM4040AEX3-5.0-T has a reverse breakdown voltage of 5.000V with a tolerance of ±5.0mV (±0.1%) at +25°C, as specified in the Electrical Characteristics table for the A-grade 5.000V variant. This value is guaranteed by 100% production testing and reflects laser-trimmed precision.
Does LM4040AEX3-5.0-T require an external output capacitor for stability?
No, the LM4040AEX3-5.0-T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC reference inputs or op-amp feedback networks - eliminating capacitor-related BOM cost and layout sensitivity.
What is the minimum operating shunt current for LM4040AEX3-5.0-T across temperature?
The LM4040AEX3-5.0-T requires a minimum shunt current of 54μA at +25°C and up to 80μA over the full -40°C to +125°C range to maintain regulation. This value is specified in the Electrical Characteristics table for the 5.000V A-grade device in SC70-3 package.
Can pin 3 of LM4040AEX3-5.0-T be left unconnected or must it be grounded?
Pin 3 of the LM4040AEX3-5.0-T is marked N.C. (No Connection) and must either be left unconnected or tied directly to pin 2 (anode). The datasheet explicitly states "PIN 3 MUST BE LEFT UNCONNECTED OR CONNECTED TO PIN 2" - connecting it elsewhere may compromise performance or reliability.
How does the temperature coefficient of LM4040AEX3-5.0-T affect voltage drift over its full operating range?
The LM4040AEX3-5.0-T has a maximum temperature coefficient of ±100ppm/°C. Over its -40°C to +125°C range (ΔT = 165°C), this results in a worst-case drift of ±16.5mV (±0.33%) from nominal 5.000V - fully characterized and guaranteed per datasheet Note 2 calculations.
LM4040AEX3-5.0-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040AEX3-5.0-T FAQ
1.How can I place an order for LM4040AEX3-5.0-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEX3-5.0-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM4040AEX3-5.0-T reliable?
The price and inventory of LM4040AEX3-5.0-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AEX3-5.0-T is usually 5 days.
3.What payment methods are accepted for LM4040AEX3-5.0-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEX3-5.0-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEX3-5.0-T?
LM4040AEX3-5.0-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEX3-5.0-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM4040AEX3-5.0-T?
For technical support, including LM4040AEX3-5.0-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEX3-5.0-T requirements.
6.How does Aetrix verify that LM4040AEX3-5.0-T is sourced from the original manufacturer or authorized distributors?
All LM4040AEX3-5.0-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM4040AEX3-5.0-T meets industry standards.
7.What is the process for return or replacement of LM4040AEX3-5.0-T?
All LM4040AEX3-5.0-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEX3-5.0-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM4040AEX3-5.0-T part is unused and in its original packaging.
Return procedure for LM4040AEX3-5.0-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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